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508 lines
13 KiB
C
508 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini grep implementation for busybox using libc regex.
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*
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* Copyright (C) 1999,2000,2001 by Lineo, inc. and Mark Whitley
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* Copyright (C) 1999,2000,2001 by Mark Whitley <markw@codepoet.org>
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*
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* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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*/
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/* BB_AUDIT SUSv3 defects - unsupported option -x. */
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/* BB_AUDIT GNU defects - always acts as -a. */
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/* http://www.opengroup.org/onlinepubs/007904975/utilities/grep.html */
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/*
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* 2004,2006 (C) Vladimir Oleynik <dzo@simtreas.ru> -
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* correction "-e pattern1 -e pattern2" logic and more optimizations.
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* precompiled regex
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*/
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/*
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* (C) 2006 Jac Goudsmit added -o option
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*/
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#include "busybox.h"
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#include "xregex.h"
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/* options */
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#define OPTSTR_GREP \
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"lnqvscFiHhe:f:Lor" \
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USE_FEATURE_GREP_CONTEXT("A:B:C:") \
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USE_FEATURE_GREP_EGREP_ALIAS("E") \
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USE_DESKTOP("w") \
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"aI"
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/* ignored: -a "assume all files to be text" */
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/* ignored: -I "assume binary files have no matches" */
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enum {
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OPTBIT_l,
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OPTBIT_n,
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OPTBIT_q,
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OPTBIT_v,
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OPTBIT_s,
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OPTBIT_c,
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OPTBIT_F,
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OPTBIT_i,
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OPTBIT_H,
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OPTBIT_h,
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OPTBIT_e,
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OPTBIT_f,
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OPTBIT_L,
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OPTBIT_o,
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OPTBIT_r,
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USE_FEATURE_GREP_CONTEXT(OPTBIT_A ,)
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USE_FEATURE_GREP_CONTEXT(OPTBIT_B ,)
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USE_FEATURE_GREP_CONTEXT(OPTBIT_C ,)
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USE_FEATURE_GREP_CONTEXT(OPTBIT_E ,)
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USE_DESKTOP( OPTBIT_w ,)
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OPT_l = 1 << OPTBIT_l,
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OPT_n = 1 << OPTBIT_n,
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OPT_q = 1 << OPTBIT_q,
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OPT_v = 1 << OPTBIT_v,
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OPT_s = 1 << OPTBIT_s,
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OPT_c = 1 << OPTBIT_c,
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OPT_F = 1 << OPTBIT_F,
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OPT_i = 1 << OPTBIT_i,
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OPT_H = 1 << OPTBIT_H,
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OPT_h = 1 << OPTBIT_h,
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OPT_e = 1 << OPTBIT_e,
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OPT_f = 1 << OPTBIT_f,
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OPT_L = 1 << OPTBIT_L,
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OPT_o = 1 << OPTBIT_o,
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OPT_r = 1 << OPTBIT_r,
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OPT_A = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_A)) + 0,
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OPT_B = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_B)) + 0,
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OPT_C = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_C)) + 0,
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OPT_E = USE_FEATURE_GREP_CONTEXT((1 << OPTBIT_E)) + 0,
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OPT_w = USE_DESKTOP( (1 << OPTBIT_w)) + 0,
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};
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#define PRINT_FILES_WITH_MATCHES (option_mask32 & OPT_l)
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#define PRINT_LINE_NUM (option_mask32 & OPT_n)
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#define BE_QUIET (option_mask32 & OPT_q)
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#define SUPPRESS_ERR_MSGS (option_mask32 & OPT_s)
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#define PRINT_MATCH_COUNTS (option_mask32 & OPT_c)
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#define FGREP_FLAG (option_mask32 & OPT_F)
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#define PRINT_FILES_WITHOUT_MATCHES (option_mask32 & OPT_L)
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typedef unsigned char byte_t;
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static int reflags;
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static byte_t invert_search;
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static byte_t print_filename;
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static byte_t open_errors;
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#if ENABLE_FEATURE_GREP_CONTEXT
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static int lines_before;
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static int lines_after;
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static char **before_buf;
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static int last_line_printed;
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#endif /* ENABLE_FEATURE_GREP_CONTEXT */
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/* globals used internally */
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static llist_t *pattern_head; /* growable list of patterns to match */
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static const char *cur_file; /* the current file we are reading */
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typedef struct grep_list_data_t {
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char *pattern;
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regex_t preg;
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#define PATTERN_MEM_A 1
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#define COMPILED 2
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int flg_mem_alocated_compiled;
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} grep_list_data_t;
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static void print_line(const char *line, int linenum, char decoration)
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{
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#if ENABLE_FEATURE_GREP_CONTEXT
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/* possibly print the little '--' separator */
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if ((lines_before || lines_after) && last_line_printed &&
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last_line_printed < linenum - 1) {
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puts("--");
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}
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last_line_printed = linenum;
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#endif
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if (print_filename)
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printf("%s%c", cur_file, decoration);
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if (PRINT_LINE_NUM)
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printf("%i%c", linenum, decoration);
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/* Emulate weird GNU grep behavior with -ov */
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if ((option_mask32 & (OPT_v+OPT_o)) != (OPT_v+OPT_o))
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puts(line);
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}
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static int grep_file(FILE *file)
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{
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char *line;
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byte_t ret;
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int linenum = 0;
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int nmatches = 0;
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regmatch_t regmatch;
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#if ENABLE_FEATURE_GREP_CONTEXT
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int print_n_lines_after = 0;
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int curpos = 0; /* track where we are in the circular 'before' buffer */
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int idx = 0; /* used for iteration through the circular buffer */
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#endif /* ENABLE_FEATURE_GREP_CONTEXT */
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while ((line = xmalloc_getline(file)) != NULL) {
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llist_t *pattern_ptr = pattern_head;
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grep_list_data_t * gl;
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linenum++;
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ret = 0;
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while (pattern_ptr) {
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gl = (grep_list_data_t *)pattern_ptr->data;
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if (FGREP_FLAG) {
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ret = strstr(line, gl->pattern) != NULL;
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} else {
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/*
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* test for a postitive-assertion match (regexec returns success (0)
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* and the user did not specify invert search), or a negative-assertion
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* match (regexec returns failure (REG_NOMATCH) and the user specified
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* invert search)
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*/
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if (!(gl->flg_mem_alocated_compiled & COMPILED)) {
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gl->flg_mem_alocated_compiled |= COMPILED;
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xregcomp(&(gl->preg), gl->pattern, reflags);
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}
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regmatch.rm_so = 0;
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regmatch.rm_eo = 0;
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if (regexec(&(gl->preg), line, 1, ®match, 0) == 0) {
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if (!(option_mask32 & OPT_w))
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ret = 1;
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else {
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char c = ' ';
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if (regmatch.rm_so)
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c = line[regmatch.rm_so - 1];
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if (!isalnum(c) && c != '_') {
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c = line[regmatch.rm_eo];
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if (!c || (!isalnum(c) && c != '_'))
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ret = 1;
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}
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}
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}
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}
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pattern_ptr = pattern_ptr->link;
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} /* while (pattern_ptr) */
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if (ret ^ invert_search) {
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if (PRINT_FILES_WITH_MATCHES || BE_QUIET)
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free(line);
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/* if we found a match but were told to be quiet, stop here */
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if (BE_QUIET || PRINT_FILES_WITHOUT_MATCHES)
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return -1;
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/* keep track of matches */
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nmatches++;
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/* if we're just printing filenames, we stop after the first match */
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if (PRINT_FILES_WITH_MATCHES)
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break;
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/* print the matched line */
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if (PRINT_MATCH_COUNTS == 0) {
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#if ENABLE_FEATURE_GREP_CONTEXT
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int prevpos = (curpos == 0) ? lines_before - 1 : curpos - 1;
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/* if we were told to print 'before' lines and there is at least
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* one line in the circular buffer, print them */
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if (lines_before && before_buf[prevpos] != NULL) {
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int first_buf_entry_line_num = linenum - lines_before;
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/* advance to the first entry in the circular buffer, and
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* figure out the line number is of the first line in the
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* buffer */
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idx = curpos;
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while (before_buf[idx] == NULL) {
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idx = (idx + 1) % lines_before;
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first_buf_entry_line_num++;
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}
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/* now print each line in the buffer, clearing them as we go */
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while (before_buf[idx] != NULL) {
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print_line(before_buf[idx], first_buf_entry_line_num, '-');
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free(before_buf[idx]);
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before_buf[idx] = NULL;
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idx = (idx + 1) % lines_before;
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first_buf_entry_line_num++;
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}
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}
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/* make a note that we need to print 'after' lines */
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print_n_lines_after = lines_after;
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#endif
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if (option_mask32 & OPT_o) {
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line[regmatch.rm_eo] = '\0';
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print_line(line + regmatch.rm_so, linenum, ':');
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} else {
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print_line(line, linenum, ':');
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}
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}
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}
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#if ENABLE_FEATURE_GREP_CONTEXT
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else { /* no match */
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/* Add the line to the circular 'before' buffer */
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if (lines_before) {
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free(before_buf[curpos]);
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before_buf[curpos] = xstrdup(line);
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curpos = (curpos + 1) % lines_before;
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}
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}
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/* if we need to print some context lines after the last match, do so */
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if (print_n_lines_after && (last_line_printed != linenum)) {
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print_line(line, linenum, '-');
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print_n_lines_after--;
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}
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#endif /* ENABLE_FEATURE_GREP_CONTEXT */
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free(line);
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}
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/* special-case file post-processing for options where we don't print line
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* matches, just filenames and possibly match counts */
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/* grep -c: print [filename:]count, even if count is zero */
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if (PRINT_MATCH_COUNTS) {
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if (print_filename)
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printf("%s:", cur_file);
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printf("%d\n", nmatches);
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}
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/* grep -l: print just the filename, but only if we grepped the line in the file */
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if (PRINT_FILES_WITH_MATCHES && nmatches > 0) {
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puts(cur_file);
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}
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/* grep -L: print just the filename, but only if we didn't grep the line in the file */
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if (PRINT_FILES_WITHOUT_MATCHES && nmatches == 0) {
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puts(cur_file);
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}
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return nmatches;
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}
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#if ENABLE_FEATURE_CLEAN_UP
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#define new_grep_list_data(p, m) add_grep_list_data(p, m)
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static char * add_grep_list_data(char *pattern, int flg_used_mem)
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#else
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#define new_grep_list_data(p, m) add_grep_list_data(p)
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static char * add_grep_list_data(char *pattern)
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#endif
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{
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grep_list_data_t *gl = xmalloc(sizeof(grep_list_data_t));
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gl->pattern = pattern;
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#if ENABLE_FEATURE_CLEAN_UP
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gl->flg_mem_alocated_compiled = flg_used_mem;
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#else
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gl->flg_mem_alocated_compiled = 0;
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#endif
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return (char *)gl;
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}
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static void load_regexes_from_file(llist_t *fopt)
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{
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char *line;
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FILE *f;
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while (fopt) {
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llist_t *cur = fopt;
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char *ffile = cur->data;
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fopt = cur->link;
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free(cur);
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f = xfopen(ffile, "r");
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while ((line = xmalloc_getline(f)) != NULL) {
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llist_add_to(&pattern_head,
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new_grep_list_data(line, PATTERN_MEM_A));
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}
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}
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}
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static int file_action_grep(const char *filename, struct stat *statbuf, void* matched, int depth)
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{
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FILE *file = fopen(filename, "r");
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if (file == NULL) {
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if (!SUPPRESS_ERR_MSGS)
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bb_perror_msg("%s", cur_file);
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open_errors = 1;
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return 0;
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}
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cur_file = filename;
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*(int*)matched += grep_file(file);
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fclose(file);
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return 1;
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}
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static int grep_dir(const char *dir)
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{
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int matched = 0;
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recursive_action(dir,
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/* recurse= */ 1,
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/* followLinks= */ 0,
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/* depthFirst= */ 1,
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/* fileAction= */ file_action_grep,
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/* dirAction= */ NULL,
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/* userData= */ &matched,
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/* depth= */ 0);
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return matched;
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}
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int grep_main(int argc, char **argv);
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int grep_main(int argc, char **argv)
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{
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FILE *file;
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int matched;
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llist_t *fopt = NULL;
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/* do normal option parsing */
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#if ENABLE_FEATURE_GREP_CONTEXT
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char *slines_after;
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char *slines_before;
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char *Copt;
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opt_complementary = "H-h:e::f::C-AB";
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getopt32(argc, argv,
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OPTSTR_GREP,
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&pattern_head, &fopt,
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&slines_after, &slines_before, &Copt);
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if (option_mask32 & OPT_C) {
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/* -C unsets prev -A and -B, but following -A or -B
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may override it */
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if (!(option_mask32 & OPT_A)) /* not overridden */
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slines_after = Copt;
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if (!(option_mask32 & OPT_B)) /* not overridden */
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slines_before = Copt;
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option_mask32 |= OPT_A|OPT_B; /* for parser */
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}
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if (option_mask32 & OPT_A) {
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lines_after = xatoi_u(slines_after);
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}
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if (option_mask32 & OPT_B) {
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lines_before = xatoi_u(slines_before);
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}
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/* sanity checks */
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if (option_mask32 & (OPT_c|OPT_q|OPT_l|OPT_L)) {
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option_mask32 &= ~OPT_n;
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lines_before = 0;
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lines_after = 0;
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} else if (lines_before > 0)
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before_buf = xzalloc(lines_before * sizeof(char *));
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#else
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/* with auto sanity checks */
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opt_complementary = "H-h:e::f::c-n:q-n:l-n";
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getopt32(argc, argv, OPTSTR_GREP,
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&pattern_head, &fopt);
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#endif
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invert_search = ((option_mask32 & OPT_v) != 0); /* 0 | 1 */
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if (pattern_head != NULL) {
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/* convert char *argv[] to grep_list_data_t */
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llist_t *cur;
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for (cur = pattern_head; cur; cur = cur->link)
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cur->data = new_grep_list_data(cur->data, 0);
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}
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if (option_mask32 & OPT_f)
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load_regexes_from_file(fopt);
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if (ENABLE_FEATURE_GREP_FGREP_ALIAS && applet_name[0] == 'f')
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option_mask32 |= OPT_F;
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if (!(option_mask32 & (OPT_o | OPT_w)))
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reflags = REG_NOSUB;
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if (ENABLE_FEATURE_GREP_EGREP_ALIAS &&
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(applet_name[0] == 'e' || (option_mask32 & OPT_E)))
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reflags |= REG_EXTENDED;
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if (option_mask32 & OPT_i)
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reflags |= REG_ICASE;
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argv += optind;
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argc -= optind;
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/* if we didn't get a pattern from a -e and no command file was specified,
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* argv[optind] should be the pattern. no pattern, no worky */
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if (pattern_head == NULL) {
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char *pattern;
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if (*argv == NULL)
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bb_show_usage();
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pattern = new_grep_list_data(*argv++, 0);
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llist_add_to(&pattern_head, pattern);
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argc--;
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}
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/* argv[(optind)..(argc-1)] should be names of file to grep through. If
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* there is more than one file to grep, we will print the filenames. */
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if (argc > 1)
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print_filename = 1;
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/* -H / -h of course override */
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if (option_mask32 & OPT_H)
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print_filename = 1;
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if (option_mask32 & OPT_h)
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print_filename = 0;
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/* If no files were specified, or '-' was specified, take input from
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* stdin. Otherwise, we grep through all the files specified. */
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if (argc == 0)
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argc++;
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matched = 0;
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while (argc--) {
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cur_file = *argv++;
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file = stdin;
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if (!cur_file || (*cur_file == '-' && !cur_file[1])) {
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cur_file = "(standard input)";
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} else {
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if (option_mask32 & OPT_r) {
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struct stat st;
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if (stat(cur_file, &st) == 0 && S_ISDIR(st.st_mode)) {
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if (!(option_mask32 & OPT_h))
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print_filename = 1;
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matched += grep_dir(cur_file);
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goto grep_done;
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}
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}
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/* else: fopen(dir) will succeed, but reading won't */
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file = fopen(cur_file, "r");
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if (file == NULL) {
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if (!SUPPRESS_ERR_MSGS)
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bb_perror_msg("%s", cur_file);
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open_errors = 1;
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continue;
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}
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}
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matched += grep_file(file);
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fclose_if_not_stdin(file);
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grep_done:
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if (matched < 0) {
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/* we found a match but were told to be quiet, stop here and
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* return success */
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break;
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}
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}
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/* destroy all the elments in the pattern list */
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if (ENABLE_FEATURE_CLEAN_UP) {
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while (pattern_head) {
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llist_t *pattern_head_ptr = pattern_head;
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grep_list_data_t *gl =
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(grep_list_data_t *)pattern_head_ptr->data;
|
|
|
|
pattern_head = pattern_head->link;
|
|
if ((gl->flg_mem_alocated_compiled & PATTERN_MEM_A))
|
|
free(gl->pattern);
|
|
if ((gl->flg_mem_alocated_compiled & COMPILED))
|
|
regfree(&(gl->preg));
|
|
free(pattern_head_ptr);
|
|
}
|
|
}
|
|
/* 0 = success, 1 = failed, 2 = error */
|
|
/* If the -q option is specified, the exit status shall be zero
|
|
* if an input line is selected, even if an error was detected. */
|
|
if (BE_QUIET && matched)
|
|
return 0;
|
|
if (open_errors)
|
|
return 2;
|
|
return !matched; /* invert return value 0 = success, 1 = failed */
|
|
}
|